*{
    padding: 0;
    margin: 0;
}
.App {
    padding: 0 100px;
}
.App >div{
    min-width: 800px;
}
.toDoList {
    margin: 0 auto;
    min-height: 360px;
    border-radius: 20px;
    border: 1px solid #cccccc;
    overflow: hidden;
    justify-content: center;
}
.operation-wrap > Button + Button {
    margin-left: 6px;
}
